The thing is that right now walls are absurdly easily destroyable with infantries.
Maybe if we either completely remove bonuses to walls from all infantries or add to walls more hp this unit will become useful as well as walls themself (both changes don't affect gates).
But right now both walls and this unit are nearly useless.

I prefer second variant – massively increasing normal walls only hp (not gates and palisades) or even just adding new though walls.
Hp must be 200-250 in base. Also siege weapons must have against it high bonus - castle-like one i think. And ofc they will take more turns to build, not 3 turns in base and 2 with ambidextria.

Agree.
Need better walls.
The current walls represent the average 3 meter high and 0.5 m wight walls. (should called graveyard walls)
Those start over 10 m hight and 3- m gross walls, used for Castles protection.
They cud garrison 1 unit and have massive Hp
of course costlier.

Also we discussed somewhere about blocking sigh for archers and defensive bonuses.
An other hard to solve question.

(I think only maceman tipe infantry (blunt weapons)should have bonus to buildings - to be somehow more realistic.
But this would ruin existing campaign and game mec.)

So just stick at making some better walls now.

For naturally blood will be of kind
Drawn-to blood, where he may it find.